Question

about how long ago did our solar system start to form?
about 14 million years ago
about 14 billion years ago
about 5 million years ago
about 5 billion years ago

Explanation:

La formación del sistema solar se estima comenzó alrededor de 4.6 mil millones de años, lo que se aproxima a "About 5 billion years ago".

Answer:

D. About 5 billion years ago